public ListNode deleteDuplicates(ListNode head) {
ListNode p = head;
while (p != null) {
ListNode temp = p;
while (temp.next != null && temp.val == temp.next.val) {
temp.next = temp.next.next;
}
p = p.next;
}
return head;
}
public ListNode oddEvenList(ListNode head) {
if (head == null || head.next == null) {
return head;
}
ListNode odd = head, even = head.next, evenHead = even;
while (even != null && even.next != null) {
odd.next = even.next;
odd = odd.next;
even.next = odd.next;
even = even.next;
}
odd.next = evenHead;
return head;
}